RESUMO
The title compound, [SnCl2(C5H4NSe)2], is the product of a reaction of 2,2'-dipyridyl diselenide with tin tetra-chloride. The mol-ecule is located about a twofold rotation axis. The coordination environment of the Sn(IV) atom is a distorted octa-hedron, with two bidentate 2-pyridine-seleno-late ligands inclined to each other at an angle of 83.96â (7)°. The two Sn-Cl and two Sn-N bonds are in cis configurations, while the two Sn-Se bonds of 2.5917â (3)â Å are in a trans configuration, with an Se-Sn-Se angle of 157.988â (15)°. In the crystal, π-π inter-actions between the pyridine rings [centroid-to-centroid distance of 3.758â (3)â Å] and weak inter-molecular C-Hâ¯Cl hydrogen bonds link the mol-ecules into chains along the c axis.
RESUMO
The title compound, [SnCl2(C5H4NS)2], is the product of reaction of 2,2'-dipyridyl disulfide with tin tetra-chloride. The Sn(IV) atom adopts a distorted octa-hedral geometry, with the two bidentate pyridine-2-thiol-ate ligands forming two planar four-membered chelate rings. The two Sn-Cl, two Sn-N and two Sn-S bonds are in cis, cis and trans configurations, respectively. The crystal grown from acetonitrile represents a new monoclinic polymorph in space group C2/c with the mol-ecule having twofold rotational symmetry, the Sn(IV) atom lying on the twofold axis. The mol-ecular structure of the monoclinic polymorph is very close to that of the triclinic polymorph studied previously in space group P-1, the mol-ecule occupying a general position [Masaki & Matsunami (1976 â¶). Bull. Chem. Soc. Jpn, 49, 3274-3279; Masaki et al. (1978 â¶). Bull. Chem. Soc. Jpn, 51, 3298-3301]. Apparently, the formation of the two polymorphs is determined by the different systems of inter-molecular inter-actions. In the crystal of the monoclinic polymorph, mol-ecules are bound into ribbons along the c axis by C-Hâ¯Cl hydrogen bonds, whereas in the crystal of the triclinic polymorph, mol-ecules form chains along the a axis by attractive Sâ¯S inter-actions. The crystal studied was a pseudo-merohedral twin; the refined BASF value is 0.221â (1).
RESUMO
The organic molecule in the title hydrate, C(9)H(9)N(3)O(3)·H(2)O, was obtained by the condenstation of salicylic aldehyde with urea in acetonitrile. The oxazine ring adopts a slightly distorted sofa conformation, with the N atom deviating from the plane passing through the other atoms of the ring by 0.267â (2)â Å. The crystal structure displays inter-molecular N-Hâ¯O and O-Hâ¯O hydrogen bonding.